Air percussion and air suction dryer for machines for continuous textile treatment

Abstract

A rotary-drum dryer for machines for continuous treatment of fabrics, operating by air percussion and air suction, either selectively or in combination, equipped with a set of control elements, able to realize different operating positions, with different distribution of both blown and intake air.

What is claimed is: 
     
       1. An air percussion and air suction dryer for appratus for continuous textile treatment comprising a rotatable, perforated, cylindrical drum, means for guiding fabric for travel around said drum, a pair of opposed tanks at least partially surrounding said drum and the fabric traveling thereon, said tanks inlcuding walls facing said drum which are perforated, fan means for blowing air through the tanks to the drum to dry the fabric on the drum, means providing a suction flow passage for the air into and through said drum, and control means for controlling the air flow through said tanks and into said drum to selectively control the flow and distribution of the air to and through the fabric to be dried, said control means comprising displaceable elements including perforated sector-shaped plates facing said walls of the tank movable between open and closed positions for selectively opening and blocking air flow through said tanks to said drum. 
     
     
       2. An air percussion and air suction dryer for appratus for continuous textile treatment comprising a rotatable, perforated, cylindrical drum, means for guiding fabric for travel around said drum, a pair of opposed tanks at least partially surrounding said drum and the fabric traveling therein, said tanks including walls facing said drum which are perforated, fan means for blowing air through the tanks to the drum to dry the fabric on the drum, means providing a suction flow passage for the air into and through said drum, and control means for controlling the air flow through said tanks and into said drum to selectively control the flow and distribution of the air to and through the fabric to be dried, said control means comprising displaceable elements movable between open and closed positions for selectively opening and blocking air flow through said tanks to said drum, said tanks each including a central perforated region and two perforated side regions, said displaceable elements of said control means being in correspondence with said side regions for selective closure thereof while said central region remains constantly open for flow of air to said drum. 
     
     
       3. A dryer as claimed in claim 1 comprising a pair of spaced chests positioned on opposite side of the guided fabric in spaced relation from the drum, said chests having air outlets facing said fabric in staggered relation, said air outlets being connected to said fan means for receiving air therefrom. 
     
     
       4. An air percussion and air suction dryer for apparatus for continuous textile treatment comprising a rotatable, perforated, cylindrical drum, means for guiding fabric for travel around said drum, a pair of opposed tanks at least partially surrounding said drum and the fabric traveling thereon, said tanks including walls facing said drum which are perforated, fan means for blowing air ththrough the tanks to the drums to dry the fabric on the drums, means providing a suction flow passage for the fan into and through said drum, and control means for controlling the air flow through said tanks and into said drum to selectively control the flow and distribution of the air to and through the fabric to be dried, said drum comprising an outer perforated cylindrical element, and an inner cylindrical element, at least a portion of which is perforated, said inner and outer cylindrical elements being coaxial; and means supporting said drum for rotation and providing an open end in communication with the inner cylindrical element and with said fan means, said control means comprising displaceable cylindrical elements operatively movable relative to said inner cylindrical element between a closed position in which the perforated portion is closed and an open position in which the perforated portion is open. 
     
     
       5. A dryer as claimed in claim 4 wherein said drum has opposite ends and means are provided at said ends with openings for suction flow of air past said ends of the drum. 
     
     
       6. A dryer as claimed in claim 5 further comprising selectively operable means for selectively opening and closing said openings to control suction flow of the air past said ends of the drum. 
     
     
       7. A dryer as claimed in claim 6, wherein said openings for suction flow of air past the ends of the drum are in communication with said fan means and with said tanks via said control means. 
     
     
       8. A dryer as claimed in claim 4, comprising a pair of spaced chests positioned on opposite sides of the guided fabric in spaced relation from the drum, said chests having air outlets facing said fabric in staggered relation, said air outlets being connected to said fan means for receiving air therefrom. 
     
     
       9. An air percussion and air suction dryer for apparatus for continuous textile treatment comprising a rotatable, perforated, cylindrical drum, means for guiding fabric for travel around said drum, a pair of opposed tanks at least partially surrounding said drum and the fabric traveling thereon, said tanks including walls facing said drum which are perforated, and means for blowing air through the tanks to the drum to dry the fabric on the drum, means providing a suction flow passage for the fan into and through said drum, and control means for controlling the air flow through said tanks and into said drum to selectively control the flow and distribution of the air to and through the fabric to be dried, said control means comprising displaceable elements movable between open and closed position for selectively opening and blocking air flow through said tanks to said drum, said drum comprising an outer perforated cylindrical element, an inner cylindrical element, at least a portion of which is perforated, said inner and outer cylindrical elements being coaxial, and means supporting said drum for rotation and providing an open end in communication with the inner cylindrical element and with said fan means, said control means further comprising displaceable cylindrical elements operatively movable relative to said inner cylindrical element between a closed position in which the perforated portion is closed and an open position in which the perforated portion is open, said drum having opposite ends, means at said ends of the drum having openings for suction flow of air past said said ends of the drum, and selectively operable means for selective opening and closing said openings to control suction flow of the air past said ends of the drum, at least one of said ends of the drum being open and in communication with said fan means. 
     
     
       10. An air percussion and air suction dryer as claimed in claim 9 comprising a pair of spaced chests positioned on opposite sides of the guided fabric in spaced relation from the drum, said chests having air outlets facing said fabric in staggered relation, said air outlets being connected to said fan means for receiving air therefrom. 
     
     
       11. A dryer as claimed in claim 10 wherein said fan means comprises a fan at each end of the drum, an air feed channel connecting the fan at one of the ends of the drum to the outlets of the chests, the fan at the other end of the drum being connected to said tanks for supply of air thereto.